feat: migrate bsc msigs

[gosuto-inzasheru]

closes #58 #59 #60 #260

• assumes merging of add helper funcs that can build execTransaction call locally #368
• to review run brownie run migrate_bsc_msigs sim --network bsc-fork
• in reality we will need to run three txs separately, of which two will need the funny manual signing
• originally i had some calls to tend and harvest in there for the strats as well but turns out the result for treasury is actually worse after tending and harvesting:

snapshot result for 0x329543f0F4BB134A3f7a826DC32532398B38a3fA:
               balance_before             balance_after             balance_delta
symbol                                                                           
bBADGER  0.000000000000000000  5,085.988296254606500670  5,085.988296254606500670
bDIGG    0.000000000000000000     14.980913413705337312     14.980913413705337312
BTCB     0.005654315964632511      1.246299303100918214      1.240644987136285703
WBNB     0.000000000000000000      6.312722825236899294      6.312722825236899294

snapshot result for 0x329543f0F4BB134A3f7a826DC32532398B38a3fA:
               balance_before             balance_after             balance_delta
symbol                                                                           
bBADGER  0.000000000000000000  4,988.180003271554387455  4,988.180003271554387455
bDIGG    0.000000000000000000     14.960238193811429288     14.960238193811429288
BTCB     0.005654315964632511      1.270084672138204054      1.264430356173571543
WBNB     0.000000000000000000      6.308291881220718194      6.308291881220718194